<batch:step id="step9">
        <batch:partition step="loadFlatFiles" partitioner="multiFileResourcePartitioner">
                    <batch:handler grid-size="15" task-executor="loadCustomerTaskExecutor" />
        </batch:partition>
    </batch:step>

<bean id="multiFileResourcePartitioner" class="com.cap1.cdi.batch.partitioner.MultiFileResourcePartitioner"
        scope="step">
        <property name="keyName" value="fileResource" />
        <property name="fileName" value="fileName" />
        <property name="directory" value="file:${input.files.location}" />
</bean>